SN7407DR by Texas Instruments(TI) Design and production,in Hong Kong QX Electronics Limited Spot sales,And can pass Hong Kong QX Electronics Limited Purchasing。SN7407DR Price reference $ 0.930000。SN7407DR - 。You can download Chinese information、Pin map、DatasheetData sheet function specification,In the information SN7407DR Detailed pin diagram and function application circuit diagram voltage and usage method and tutorial